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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "FilterBandpass.h"
#include "Filterfill.h"
#include "Pixel8.h"
#include "Bitmap.h"
#include <iostream>
#include <math.h>
using namespace std;
namespace avg {
FilterBandpass::FilterBandpass(float lowWidth, float highWidth)
: m_HighpassFilter(highWidth),
m_LowpassFilter(lowWidth)
{
m_FilterWidthDiff = int(ceil(highWidth))-int(ceil(lowWidth));
}
FilterBandpass::~FilterBandpass()
{
}
BitmapPtr FilterBandpass::apply(BitmapPtr pBmpSrc)
{
BitmapPtr pLPBmp = m_LowpassFilter.apply(pBmpSrc);
BitmapPtr pHPBmp = m_HighpassFilter.apply(pBmpSrc);
IntPoint Size = pHPBmp->getSize();
BitmapPtr pDestBmp = BitmapPtr(new Bitmap(Size, I8, pBmpSrc->getName()));
int lpStride = pLPBmp->getStride();
int hpStride = pHPBmp->getStride();
int destStride = pDestBmp->getStride();
unsigned char * pLPLine = pLPBmp->getPixels()+m_FilterWidthDiff*lpStride;
unsigned char * pHPLine = pHPBmp->getPixels();
unsigned char * pDestLine = pDestBmp->getPixels();
for (int y = 0; y < Size.y; ++y) {
unsigned char * pLPPixel = pLPLine+m_FilterWidthDiff;
unsigned char * pHPPixel = pHPLine;
unsigned char * pDestPixel = pDestLine;
for (int x = 0; x < Size.x; ++x) {
*pDestPixel = (int(*pLPPixel)-*pHPPixel)+128;
++pLPPixel;
++pHPPixel;
++pDestPixel;
}
pLPLine += lpStride;
pHPLine += hpStride;
pDestLine += destStride;
}
return pDestBmp;
}
}
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